1 /* 2 * Author: Tatu Ylonen <ylo@cs.hut.fi> 3 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4 * All rights reserved 5 * Identity and host key generation and maintenance. 6 * 7 * As far as I am concerned, the code I have written for this software 8 * can be used freely for any purpose. Any derived versions of this 9 * software must be clearly marked as such, and if the derived work is 10 * incompatible with the protocol description in the RFC file, it must be 11 * called by a name other than "ssh" or "Secure Shell". 12 */ 13 14 #include "includes.h" 15 RCSID("$OpenBSD: ssh-keygen.c,v 1.135 2005/11/29 02:04:55 dtucker Exp $"); 16 17 #include <openssl/evp.h> 18 #include <openssl/pem.h> 19 20 #include "xmalloc.h" 21 #include "key.h" 22 #include "rsa.h" 23 #include "authfile.h" 24 #include "uuencode.h" 25 #include "buffer.h" 26 #include "bufaux.h" 27 #include "pathnames.h" 28 #include "log.h" 29 #include "misc.h" 30 #include "match.h" 31 #include "hostfile.h" 32 33 #ifdef SMARTCARD 34 #include "scard.h" 35 #endif 36 #include "dns.h" 37 38 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ 39 #define DEFAULT_BITS 2048 40 #define DEFAULT_BITS_DSA 1024 41 u_int32_t bits = 0; 42 43 /* 44 * Flag indicating that we just want to change the passphrase. This can be 45 * set on the command line. 46 */ 47 int change_passphrase = 0; 48 49 /* 50 * Flag indicating that we just want to change the comment. This can be set 51 * on the command line. 52 */ 53 int change_comment = 0; 54 55 int quiet = 0; 56 57 /* Flag indicating that we want to hash a known_hosts file */ 58 int hash_hosts = 0; 59 /* Flag indicating that we want lookup a host in known_hosts file */ 60 int find_host = 0; 61 /* Flag indicating that we want to delete a host from a known_hosts file */ 62 int delete_host = 0; 63 64 /* Flag indicating that we just want to see the key fingerprint */ 65 int print_fingerprint = 0; 66 int print_bubblebabble = 0; 67 68 /* The identity file name, given on the command line or entered by the user. */ 69 char identity_file[1024]; 70 int have_identity = 0; 71 72 /* This is set to the passphrase if given on the command line. */ 73 char *identity_passphrase = NULL; 74 75 /* This is set to the new passphrase if given on the command line. */ 76 char *identity_new_passphrase = NULL; 77 78 /* This is set to the new comment if given on the command line. */ 79 char *identity_comment = NULL; 80 81 /* Dump public key file in format used by real and the original SSH 2 */ 82 int convert_to_ssh2 = 0; 83 int convert_from_ssh2 = 0; 84 int print_public = 0; 85 int print_generic = 0; 86 87 char *key_type_name = NULL; 88 89 /* argv0 */ 90 extern char *__progname; 91 92 char hostname[MAXHOSTNAMELEN]; 93 94 /* moduli.c */ 95 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); 96 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); 97 98 static void 99 ask_filename(struct passwd *pw, const char *prompt) 100 { 101 char buf[1024]; 102 char *name = NULL; 103 104 if (key_type_name == NULL) 105 name = _PATH_SSH_CLIENT_ID_RSA; 106 else 107 switch (key_type_from_name(key_type_name)) { 108 case KEY_RSA1: 109 name = _PATH_SSH_CLIENT_IDENTITY; 110 break; 111 case KEY_DSA: 112 name = _PATH_SSH_CLIENT_ID_DSA; 113 break; 114 case KEY_RSA: 115 name = _PATH_SSH_CLIENT_ID_RSA; 116 break; 117 default: 118 fprintf(stderr, "bad key type"); 119 exit(1); 120 break; 121 } 122 123 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); 124 fprintf(stderr, "%s (%s): ", prompt, identity_file); 125 if (fgets(buf, sizeof(buf), stdin) == NULL) 126 exit(1); 127 if (strchr(buf, '\n')) 128 *strchr(buf, '\n') = 0; 129 if (strcmp(buf, "") != 0) 130 strlcpy(identity_file, buf, sizeof(identity_file)); 131 have_identity = 1; 132 } 133 134 static Key * 135 load_identity(char *filename) 136 { 137 char *pass; 138 Key *prv; 139 140 prv = key_load_private(filename, "", NULL); 141 if (prv == NULL) { 142 if (identity_passphrase) 143 pass = xstrdup(identity_passphrase); 144 else 145 pass = read_passphrase("Enter passphrase: ", 146 RP_ALLOW_STDIN); 147 prv = key_load_private(filename, pass, NULL); 148 memset(pass, 0, strlen(pass)); 149 xfree(pass); 150 } 151 return prv; 152 } 153 154 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" 155 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" 156 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" 157 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb 158 159 static void 160 do_convert_to_ssh2(struct passwd *pw) 161 { 162 Key *k; 163 u_int len; 164 u_char *blob; 165 struct stat st; 166 167 if (!have_identity) 168 ask_filename(pw, "Enter file in which the key is"); 169 if (stat(identity_file, &st) < 0) { 170 perror(identity_file); 171 exit(1); 172 } 173 if ((k = key_load_public(identity_file, NULL)) == NULL) { 174 if ((k = load_identity(identity_file)) == NULL) { 175 fprintf(stderr, "load failed\n"); 176 exit(1); 177 } 178 } 179 if (k->type == KEY_RSA1) { 180 fprintf(stderr, "version 1 keys are not supported\n"); 181 exit(1); 182 } 183 if (key_to_blob(k, &blob, &len) <= 0) { 184 fprintf(stderr, "key_to_blob failed\n"); 185 exit(1); 186 } 187 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); 188 fprintf(stdout, 189 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", 190 key_size(k), key_type(k), 191 pw->pw_name, hostname); 192 dump_base64(stdout, blob, len); 193 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); 194 key_free(k); 195 xfree(blob); 196 exit(0); 197 } 198 199 static void 200 buffer_get_bignum_bits(Buffer *b, BIGNUM *value) 201 { 202 u_int bignum_bits = buffer_get_int(b); 203 u_int bytes = (bignum_bits + 7) / 8; 204 205 if (buffer_len(b) < bytes) 206 fatal("buffer_get_bignum_bits: input buffer too small: " 207 "need %d have %d", bytes, buffer_len(b)); 208 BN_bin2bn(buffer_ptr(b), bytes, value); 209 buffer_consume(b, bytes); 210 } 211 212 static Key * 213 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) 214 { 215 Buffer b; 216 Key *key = NULL; 217 char *type, *cipher; 218 u_char *sig, data[] = "abcde12345"; 219 int magic, rlen, ktype, i1, i2, i3, i4; 220 u_int slen; 221 u_long e; 222 223 buffer_init(&b); 224 buffer_append(&b, blob, blen); 225 226 magic = buffer_get_int(&b); 227 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { 228 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); 229 buffer_free(&b); 230 return NULL; 231 } 232 i1 = buffer_get_int(&b); 233 type = buffer_get_string(&b, NULL); 234 cipher = buffer_get_string(&b, NULL); 235 i2 = buffer_get_int(&b); 236 i3 = buffer_get_int(&b); 237 i4 = buffer_get_int(&b); 238 debug("ignore (%d %d %d %d)", i1,i2,i3,i4); 239 if (strcmp(cipher, "none") != 0) { 240 error("unsupported cipher %s", cipher); 241 xfree(cipher); 242 buffer_free(&b); 243 xfree(type); 244 return NULL; 245 } 246 xfree(cipher); 247 248 if (strstr(type, "dsa")) { 249 ktype = KEY_DSA; 250 } else if (strstr(type, "rsa")) { 251 ktype = KEY_RSA; 252 } else { 253 buffer_free(&b); 254 xfree(type); 255 return NULL; 256 } 257 key = key_new_private(ktype); 258 xfree(type); 259 260 switch (key->type) { 261 case KEY_DSA: 262 buffer_get_bignum_bits(&b, key->dsa->p); 263 buffer_get_bignum_bits(&b, key->dsa->g); 264 buffer_get_bignum_bits(&b, key->dsa->q); 265 buffer_get_bignum_bits(&b, key->dsa->pub_key); 266 buffer_get_bignum_bits(&b, key->dsa->priv_key); 267 break; 268 case KEY_RSA: 269 e = buffer_get_char(&b); 270 debug("e %lx", e); 271 if (e < 30) { 272 e <<= 8; 273 e += buffer_get_char(&b); 274 debug("e %lx", e); 275 e <<= 8; 276 e += buffer_get_char(&b); 277 debug("e %lx", e); 278 } 279 if (!BN_set_word(key->rsa->e, e)) { 280 buffer_free(&b); 281 key_free(key); 282 return NULL; 283 } 284 buffer_get_bignum_bits(&b, key->rsa->d); 285 buffer_get_bignum_bits(&b, key->rsa->n); 286 buffer_get_bignum_bits(&b, key->rsa->iqmp); 287 buffer_get_bignum_bits(&b, key->rsa->q); 288 buffer_get_bignum_bits(&b, key->rsa->p); 289 rsa_generate_additional_parameters(key->rsa); 290 break; 291 } 292 rlen = buffer_len(&b); 293 if (rlen != 0) 294 error("do_convert_private_ssh2_from_blob: " 295 "remaining bytes in key blob %d", rlen); 296 buffer_free(&b); 297 298 /* try the key */ 299 key_sign(key, &sig, &slen, data, sizeof(data)); 300 key_verify(key, sig, slen, data, sizeof(data)); 301 xfree(sig); 302 return key; 303 } 304 305 static void 306 do_convert_from_ssh2(struct passwd *pw) 307 { 308 Key *k; 309 int blen; 310 u_int len; 311 char line[1024], *p; 312 u_char blob[8096]; 313 char encoded[8096]; 314 struct stat st; 315 int escaped = 0, private = 0, ok; 316 FILE *fp; 317 318 if (!have_identity) 319 ask_filename(pw, "Enter file in which the key is"); 320 if (stat(identity_file, &st) < 0) { 321 perror(identity_file); 322 exit(1); 323 } 324 fp = fopen(identity_file, "r"); 325 if (fp == NULL) { 326 perror(identity_file); 327 exit(1); 328 } 329 encoded[0] = '\0'; 330 while (fgets(line, sizeof(line), fp)) { 331 if (!(p = strchr(line, '\n'))) { 332 fprintf(stderr, "input line too long.\n"); 333 exit(1); 334 } 335 if (p > line && p[-1] == '\\') 336 escaped++; 337 if (strncmp(line, "----", 4) == 0 || 338 strstr(line, ": ") != NULL) { 339 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) 340 private = 1; 341 if (strstr(line, " END ") != NULL) { 342 break; 343 } 344 /* fprintf(stderr, "ignore: %s", line); */ 345 continue; 346 } 347 if (escaped) { 348 escaped--; 349 /* fprintf(stderr, "escaped: %s", line); */ 350 continue; 351 } 352 *p = '\0'; 353 strlcat(encoded, line, sizeof(encoded)); 354 } 355 len = strlen(encoded); 356 if (((len % 4) == 3) && 357 (encoded[len-1] == '=') && 358 (encoded[len-2] == '=') && 359 (encoded[len-3] == '=')) 360 encoded[len-3] = '\0'; 361 blen = uudecode(encoded, blob, sizeof(blob)); 362 if (blen < 0) { 363 fprintf(stderr, "uudecode failed.\n"); 364 exit(1); 365 } 366 k = private ? 367 do_convert_private_ssh2_from_blob(blob, blen) : 368 key_from_blob(blob, blen); 369 if (k == NULL) { 370 fprintf(stderr, "decode blob failed.\n"); 371 exit(1); 372 } 373 ok = private ? 374 (k->type == KEY_DSA ? 375 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : 376 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : 377 key_write(k, stdout); 378 if (!ok) { 379 fprintf(stderr, "key write failed"); 380 exit(1); 381 } 382 key_free(k); 383 if (!private) 384 fprintf(stdout, "\n"); 385 fclose(fp); 386 exit(0); 387 } 388 389 static void 390 do_print_public(struct passwd *pw) 391 { 392 Key *prv; 393 struct stat st; 394 395 if (!have_identity) 396 ask_filename(pw, "Enter file in which the key is"); 397 if (stat(identity_file, &st) < 0) { 398 perror(identity_file); 399 exit(1); 400 } 401 prv = load_identity(identity_file); 402 if (prv == NULL) { 403 fprintf(stderr, "load failed\n"); 404 exit(1); 405 } 406 if (!key_write(prv, stdout)) 407 fprintf(stderr, "key_write failed"); 408 key_free(prv); 409 fprintf(stdout, "\n"); 410 exit(0); 411 } 412 413 #ifdef SMARTCARD 414 static void 415 do_upload(struct passwd *pw, const char *sc_reader_id) 416 { 417 Key *prv = NULL; 418 struct stat st; 419 int ret; 420 421 if (!have_identity) 422 ask_filename(pw, "Enter file in which the key is"); 423 if (stat(identity_file, &st) < 0) { 424 perror(identity_file); 425 exit(1); 426 } 427 prv = load_identity(identity_file); 428 if (prv == NULL) { 429 error("load failed"); 430 exit(1); 431 } 432 ret = sc_put_key(prv, sc_reader_id); 433 key_free(prv); 434 if (ret < 0) 435 exit(1); 436 logit("loading key done"); 437 exit(0); 438 } 439 440 static void 441 do_download(struct passwd *pw, const char *sc_reader_id) 442 { 443 Key **keys = NULL; 444 int i; 445 446 keys = sc_get_keys(sc_reader_id, NULL); 447 if (keys == NULL) 448 fatal("cannot read public key from smartcard"); 449 for (i = 0; keys[i]; i++) { 450 key_write(keys[i], stdout); 451 key_free(keys[i]); 452 fprintf(stdout, "\n"); 453 } 454 xfree(keys); 455 exit(0); 456 } 457 #endif /* SMARTCARD */ 458 459 static void 460 do_fingerprint(struct passwd *pw) 461 { 462 FILE *f; 463 Key *public; 464 char *comment = NULL, *cp, *ep, line[16*1024], *fp; 465 int i, skip = 0, num = 1, invalid = 1; 466 enum fp_rep rep; 467 enum fp_type fptype; 468 struct stat st; 469 470 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; 471 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; 472 473 if (!have_identity) 474 ask_filename(pw, "Enter file in which the key is"); 475 if (stat(identity_file, &st) < 0) { 476 perror(identity_file); 477 exit(1); 478 } 479 public = key_load_public(identity_file, &comment); 480 if (public != NULL) { 481 fp = key_fingerprint(public, fptype, rep); 482 printf("%u %s %s\n", key_size(public), fp, comment); 483 key_free(public); 484 xfree(comment); 485 xfree(fp); 486 exit(0); 487 } 488 if (comment) 489 xfree(comment); 490 491 f = fopen(identity_file, "r"); 492 if (f != NULL) { 493 while (fgets(line, sizeof(line), f)) { 494 i = strlen(line) - 1; 495 if (line[i] != '\n') { 496 error("line %d too long: %.40s...", num, line); 497 skip = 1; 498 continue; 499 } 500 num++; 501 if (skip) { 502 skip = 0; 503 continue; 504 } 505 line[i] = '\0'; 506 507 /* Skip leading whitespace, empty and comment lines. */ 508 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 509 ; 510 if (!*cp || *cp == '\n' || *cp == '#') 511 continue ; 512 i = strtol(cp, &ep, 10); 513 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { 514 int quoted = 0; 515 comment = cp; 516 for (; *cp && (quoted || (*cp != ' ' && 517 *cp != '\t')); cp++) { 518 if (*cp == '\\' && cp[1] == '"') 519 cp++; /* Skip both */ 520 else if (*cp == '"') 521 quoted = !quoted; 522 } 523 if (!*cp) 524 continue; 525 *cp++ = '\0'; 526 } 527 ep = cp; 528 public = key_new(KEY_RSA1); 529 if (key_read(public, &cp) != 1) { 530 cp = ep; 531 key_free(public); 532 public = key_new(KEY_UNSPEC); 533 if (key_read(public, &cp) != 1) { 534 key_free(public); 535 continue; 536 } 537 } 538 comment = *cp ? cp : comment; 539 fp = key_fingerprint(public, fptype, rep); 540 printf("%u %s %s\n", key_size(public), fp, 541 comment ? comment : "no comment"); 542 xfree(fp); 543 key_free(public); 544 invalid = 0; 545 } 546 fclose(f); 547 } 548 if (invalid) { 549 printf("%s is not a public key file.\n", identity_file); 550 exit(1); 551 } 552 exit(0); 553 } 554 555 static void 556 print_host(FILE *f, char *name, Key *public, int hash) 557 { 558 if (hash && (name = host_hash(name, NULL, 0)) == NULL) 559 fatal("hash_host failed"); 560 fprintf(f, "%s ", name); 561 if (!key_write(public, f)) 562 fatal("key_write failed"); 563 fprintf(f, "\n"); 564 } 565 566 static void 567 do_known_hosts(struct passwd *pw, const char *name) 568 { 569 FILE *in, *out = stdout; 570 Key *public; 571 char *cp, *cp2, *kp, *kp2; 572 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; 573 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; 574 575 if (!have_identity) { 576 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); 577 if (strlcpy(identity_file, cp, sizeof(identity_file)) >= 578 sizeof(identity_file)) 579 fatal("Specified known hosts path too long"); 580 xfree(cp); 581 have_identity = 1; 582 } 583 if ((in = fopen(identity_file, "r")) == NULL) 584 fatal("fopen: %s", strerror(errno)); 585 586 /* 587 * Find hosts goes to stdout, hash and deletions happen in-place 588 * A corner case is ssh-keygen -HF foo, which should go to stdout 589 */ 590 if (!find_host && (hash_hosts || delete_host)) { 591 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || 592 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || 593 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || 594 strlcat(old, ".old", sizeof(old)) >= sizeof(old)) 595 fatal("known_hosts path too long"); 596 umask(077); 597 if ((c = mkstemp(tmp)) == -1) 598 fatal("mkstemp: %s", strerror(errno)); 599 if ((out = fdopen(c, "w")) == NULL) { 600 c = errno; 601 unlink(tmp); 602 fatal("fdopen: %s", strerror(c)); 603 } 604 inplace = 1; 605 } 606 607 while (fgets(line, sizeof(line), in)) { 608 num++; 609 i = strlen(line) - 1; 610 if (line[i] != '\n') { 611 error("line %d too long: %.40s...", num, line); 612 skip = 1; 613 invalid = 1; 614 continue; 615 } 616 if (skip) { 617 skip = 0; 618 continue; 619 } 620 line[i] = '\0'; 621 622 /* Skip leading whitespace, empty and comment lines. */ 623 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 624 ; 625 if (!*cp || *cp == '\n' || *cp == '#') { 626 if (inplace) 627 fprintf(out, "%s\n", cp); 628 continue; 629 } 630 /* Find the end of the host name portion. */ 631 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) 632 ; 633 if (*kp == '\0' || *(kp + 1) == '\0') { 634 error("line %d missing key: %.40s...", 635 num, line); 636 invalid = 1; 637 continue; 638 } 639 *kp++ = '\0'; 640 kp2 = kp; 641 642 public = key_new(KEY_RSA1); 643 if (key_read(public, &kp) != 1) { 644 kp = kp2; 645 key_free(public); 646 public = key_new(KEY_UNSPEC); 647 if (key_read(public, &kp) != 1) { 648 error("line %d invalid key: %.40s...", 649 num, line); 650 key_free(public); 651 invalid = 1; 652 continue; 653 } 654 } 655 656 if (*cp == HASH_DELIM) { 657 if (find_host || delete_host) { 658 cp2 = host_hash(name, cp, strlen(cp)); 659 if (cp2 == NULL) { 660 error("line %d: invalid hashed " 661 "name: %.64s...", num, line); 662 invalid = 1; 663 continue; 664 } 665 c = (strcmp(cp2, cp) == 0); 666 if (find_host && c) { 667 printf("# Host %s found: " 668 "line %d type %s\n", name, 669 num, key_type(public)); 670 print_host(out, cp, public, 0); 671 } 672 if (delete_host && !c) 673 print_host(out, cp, public, 0); 674 } else if (hash_hosts) 675 print_host(out, cp, public, 0); 676 } else { 677 if (find_host || delete_host) { 678 c = (match_hostname(name, cp, 679 strlen(cp)) == 1); 680 if (find_host && c) { 681 printf("# Host %s found: " 682 "line %d type %s\n", name, 683 num, key_type(public)); 684 print_host(out, cp, public, hash_hosts); 685 } 686 if (delete_host && !c) 687 print_host(out, cp, public, 0); 688 } else if (hash_hosts) { 689 for (cp2 = strsep(&cp, ","); 690 cp2 != NULL && *cp2 != '\0'; 691 cp2 = strsep(&cp, ",")) { 692 if (strcspn(cp2, "*?!") != strlen(cp2)) 693 fprintf(stderr, "Warning: " 694 "ignoring host name with " 695 "metacharacters: %.64s\n", 696 cp2); 697 else 698 print_host(out, cp2, public, 1); 699 } 700 has_unhashed = 1; 701 } 702 } 703 key_free(public); 704 } 705 fclose(in); 706 707 if (invalid) { 708 fprintf(stderr, "%s is not a valid known_host file.\n", 709 identity_file); 710 if (inplace) { 711 fprintf(stderr, "Not replacing existing known_hosts " 712 "file because of errors\n"); 713 fclose(out); 714 unlink(tmp); 715 } 716 exit(1); 717 } 718 719 if (inplace) { 720 fclose(out); 721 722 /* Backup existing file */ 723 if (unlink(old) == -1 && errno != ENOENT) 724 fatal("unlink %.100s: %s", old, strerror(errno)); 725 if (link(identity_file, old) == -1) 726 fatal("link %.100s to %.100s: %s", identity_file, old, 727 strerror(errno)); 728 /* Move new one into place */ 729 if (rename(tmp, identity_file) == -1) { 730 error("rename\"%s\" to \"%s\": %s", tmp, identity_file, 731 strerror(errno)); 732 unlink(tmp); 733 unlink(old); 734 exit(1); 735 } 736 737 fprintf(stderr, "%s updated.\n", identity_file); 738 fprintf(stderr, "Original contents retained as %s\n", old); 739 if (has_unhashed) { 740 fprintf(stderr, "WARNING: %s contains unhashed " 741 "entries\n", old); 742 fprintf(stderr, "Delete this file to ensure privacy " 743 "of hostnames\n"); 744 } 745 } 746 747 exit(0); 748 } 749 750 /* 751 * Perform changing a passphrase. The argument is the passwd structure 752 * for the current user. 753 */ 754 static void 755 do_change_passphrase(struct passwd *pw) 756 { 757 char *comment; 758 char *old_passphrase, *passphrase1, *passphrase2; 759 struct stat st; 760 Key *private; 761 762 if (!have_identity) 763 ask_filename(pw, "Enter file in which the key is"); 764 if (stat(identity_file, &st) < 0) { 765 perror(identity_file); 766 exit(1); 767 } 768 /* Try to load the file with empty passphrase. */ 769 private = key_load_private(identity_file, "", &comment); 770 if (private == NULL) { 771 if (identity_passphrase) 772 old_passphrase = xstrdup(identity_passphrase); 773 else 774 old_passphrase = 775 read_passphrase("Enter old passphrase: ", 776 RP_ALLOW_STDIN); 777 private = key_load_private(identity_file, old_passphrase, 778 &comment); 779 memset(old_passphrase, 0, strlen(old_passphrase)); 780 xfree(old_passphrase); 781 if (private == NULL) { 782 printf("Bad passphrase.\n"); 783 exit(1); 784 } 785 } 786 printf("Key has comment '%s'\n", comment); 787 788 /* Ask the new passphrase (twice). */ 789 if (identity_new_passphrase) { 790 passphrase1 = xstrdup(identity_new_passphrase); 791 passphrase2 = NULL; 792 } else { 793 passphrase1 = 794 read_passphrase("Enter new passphrase (empty for no " 795 "passphrase): ", RP_ALLOW_STDIN); 796 passphrase2 = read_passphrase("Enter same passphrase again: ", 797 RP_ALLOW_STDIN); 798 799 /* Verify that they are the same. */ 800 if (strcmp(passphrase1, passphrase2) != 0) { 801 memset(passphrase1, 0, strlen(passphrase1)); 802 memset(passphrase2, 0, strlen(passphrase2)); 803 xfree(passphrase1); 804 xfree(passphrase2); 805 printf("Pass phrases do not match. Try again.\n"); 806 exit(1); 807 } 808 /* Destroy the other copy. */ 809 memset(passphrase2, 0, strlen(passphrase2)); 810 xfree(passphrase2); 811 } 812 813 /* Save the file using the new passphrase. */ 814 if (!key_save_private(private, identity_file, passphrase1, comment)) { 815 printf("Saving the key failed: %s.\n", identity_file); 816 memset(passphrase1, 0, strlen(passphrase1)); 817 xfree(passphrase1); 818 key_free(private); 819 xfree(comment); 820 exit(1); 821 } 822 /* Destroy the passphrase and the copy of the key in memory. */ 823 memset(passphrase1, 0, strlen(passphrase1)); 824 xfree(passphrase1); 825 key_free(private); /* Destroys contents */ 826 xfree(comment); 827 828 printf("Your identification has been saved with the new passphrase.\n"); 829 exit(0); 830 } 831 832 /* 833 * Print the SSHFP RR. 834 */ 835 static void 836 do_print_resource_record(struct passwd *pw, char *hname) 837 { 838 Key *public; 839 char *comment = NULL; 840 struct stat st; 841 842 if (!have_identity) 843 ask_filename(pw, "Enter file in which the key is"); 844 if (stat(identity_file, &st) < 0) { 845 perror(identity_file); 846 exit(1); 847 } 848 public = key_load_public(identity_file, &comment); 849 if (public != NULL) { 850 export_dns_rr(hname, public, stdout, print_generic); 851 key_free(public); 852 xfree(comment); 853 exit(0); 854 } 855 if (comment) 856 xfree(comment); 857 858 printf("failed to read v2 public key from %s.\n", identity_file); 859 exit(1); 860 } 861 862 /* 863 * Change the comment of a private key file. 864 */ 865 static void 866 do_change_comment(struct passwd *pw) 867 { 868 char new_comment[1024], *comment, *passphrase; 869 Key *private; 870 Key *public; 871 struct stat st; 872 FILE *f; 873 int fd; 874 875 if (!have_identity) 876 ask_filename(pw, "Enter file in which the key is"); 877 if (stat(identity_file, &st) < 0) { 878 perror(identity_file); 879 exit(1); 880 } 881 private = key_load_private(identity_file, "", &comment); 882 if (private == NULL) { 883 if (identity_passphrase) 884 passphrase = xstrdup(identity_passphrase); 885 else if (identity_new_passphrase) 886 passphrase = xstrdup(identity_new_passphrase); 887 else 888 passphrase = read_passphrase("Enter passphrase: ", 889 RP_ALLOW_STDIN); 890 /* Try to load using the passphrase. */ 891 private = key_load_private(identity_file, passphrase, &comment); 892 if (private == NULL) { 893 memset(passphrase, 0, strlen(passphrase)); 894 xfree(passphrase); 895 printf("Bad passphrase.\n"); 896 exit(1); 897 } 898 } else { 899 passphrase = xstrdup(""); 900 } 901 if (private->type != KEY_RSA1) { 902 fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); 903 key_free(private); 904 exit(1); 905 } 906 printf("Key now has comment '%s'\n", comment); 907 908 if (identity_comment) { 909 strlcpy(new_comment, identity_comment, sizeof(new_comment)); 910 } else { 911 printf("Enter new comment: "); 912 fflush(stdout); 913 if (!fgets(new_comment, sizeof(new_comment), stdin)) { 914 memset(passphrase, 0, strlen(passphrase)); 915 key_free(private); 916 exit(1); 917 } 918 if (strchr(new_comment, '\n')) 919 *strchr(new_comment, '\n') = 0; 920 } 921 922 /* Save the file using the new passphrase. */ 923 if (!key_save_private(private, identity_file, passphrase, new_comment)) { 924 printf("Saving the key failed: %s.\n", identity_file); 925 memset(passphrase, 0, strlen(passphrase)); 926 xfree(passphrase); 927 key_free(private); 928 xfree(comment); 929 exit(1); 930 } 931 memset(passphrase, 0, strlen(passphrase)); 932 xfree(passphrase); 933 public = key_from_private(private); 934 key_free(private); 935 936 strlcat(identity_file, ".pub", sizeof(identity_file)); 937 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 938 if (fd == -1) { 939 printf("Could not save your public key in %s\n", identity_file); 940 exit(1); 941 } 942 f = fdopen(fd, "w"); 943 if (f == NULL) { 944 printf("fdopen %s failed", identity_file); 945 exit(1); 946 } 947 if (!key_write(public, f)) 948 fprintf(stderr, "write key failed"); 949 key_free(public); 950 fprintf(f, " %s\n", new_comment); 951 fclose(f); 952 953 xfree(comment); 954 955 printf("The comment in your key file has been changed.\n"); 956 exit(0); 957 } 958 959 static void 960 usage(void) 961 { 962 fprintf(stderr, "Usage: %s [options]\n", __progname); 963 fprintf(stderr, "Options:\n"); 964 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); 965 fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); 966 fprintf(stderr, " -b bits Number of bits in the key to create.\n"); 967 fprintf(stderr, " -C comment Provide new comment.\n"); 968 fprintf(stderr, " -c Change comment in private and public key files.\n"); 969 #ifdef SMARTCARD 970 fprintf(stderr, " -D reader Download public key from smartcard.\n"); 971 #endif /* SMARTCARD */ 972 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); 973 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); 974 fprintf(stderr, " -f filename Filename of the key file.\n"); 975 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); 976 fprintf(stderr, " -g Use generic DNS resource record format.\n"); 977 fprintf(stderr, " -H Hash names in known_hosts file.\n"); 978 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); 979 fprintf(stderr, " -l Show fingerprint of key file.\n"); 980 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); 981 fprintf(stderr, " -N phrase Provide new passphrase.\n"); 982 fprintf(stderr, " -P phrase Provide old passphrase.\n"); 983 fprintf(stderr, " -p Change passphrase of private key file.\n"); 984 fprintf(stderr, " -q Quiet.\n"); 985 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); 986 fprintf(stderr, " -r hostname Print DNS resource record.\n"); 987 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); 988 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); 989 fprintf(stderr, " -t type Specify type of key to create.\n"); 990 #ifdef SMARTCARD 991 fprintf(stderr, " -U reader Upload private key to smartcard.\n"); 992 #endif /* SMARTCARD */ 993 fprintf(stderr, " -v Verbose.\n"); 994 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); 995 fprintf(stderr, " -y Read private key file and print public key.\n"); 996 997 exit(1); 998 } 999 1000 /* 1001 * Main program for key management. 1002 */ 1003 int 1004 main(int ac, char **av) 1005 { 1006 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; 1007 char out_file[MAXPATHLEN], *reader_id = NULL; 1008 char *rr_hostname = NULL; 1009 Key *private, *public; 1010 struct passwd *pw; 1011 struct stat st; 1012 int opt, type, fd, download = 0; 1013 u_int32_t memory = 0, generator_wanted = 0, trials = 100; 1014 int do_gen_candidates = 0, do_screen_candidates = 0; 1015 int log_level = SYSLOG_LEVEL_INFO; 1016 BIGNUM *start = NULL; 1017 FILE *f; 1018 const char *errstr; 1019 1020 extern int optind; 1021 extern char *optarg; 1022 1023 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 1024 sanitise_stdfd(); 1025 1026 __progname = ssh_get_progname(av[0]); 1027 1028 SSLeay_add_all_algorithms(); 1029 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); 1030 1031 init_rng(); 1032 seed_rng(); 1033 1034 /* we need this for the home * directory. */ 1035 pw = getpwuid(getuid()); 1036 if (!pw) { 1037 printf("You don't exist, go away!\n"); 1038 exit(1); 1039 } 1040 if (gethostname(hostname, sizeof(hostname)) < 0) { 1041 perror("gethostname"); 1042 exit(1); 1043 } 1044 1045 while ((opt = getopt(ac, av, 1046 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) { 1047 switch (opt) { 1048 case 'b': 1049 bits = strtonum(optarg, 768, 32768, &errstr); 1050 if (errstr) 1051 fatal("Bits has bad value %s (%s)", 1052 optarg, errstr); 1053 break; 1054 case 'F': 1055 find_host = 1; 1056 rr_hostname = optarg; 1057 break; 1058 case 'H': 1059 hash_hosts = 1; 1060 break; 1061 case 'R': 1062 delete_host = 1; 1063 rr_hostname = optarg; 1064 break; 1065 case 'l': 1066 print_fingerprint = 1; 1067 break; 1068 case 'B': 1069 print_bubblebabble = 1; 1070 break; 1071 case 'p': 1072 change_passphrase = 1; 1073 break; 1074 case 'c': 1075 change_comment = 1; 1076 break; 1077 case 'f': 1078 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= 1079 sizeof(identity_file)) 1080 fatal("Identity filename too long"); 1081 have_identity = 1; 1082 break; 1083 case 'g': 1084 print_generic = 1; 1085 break; 1086 case 'P': 1087 identity_passphrase = optarg; 1088 break; 1089 case 'N': 1090 identity_new_passphrase = optarg; 1091 break; 1092 case 'C': 1093 identity_comment = optarg; 1094 break; 1095 case 'q': 1096 quiet = 1; 1097 break; 1098 case 'e': 1099 case 'x': 1100 /* export key */ 1101 convert_to_ssh2 = 1; 1102 break; 1103 case 'i': 1104 case 'X': 1105 /* import key */ 1106 convert_from_ssh2 = 1; 1107 break; 1108 case 'y': 1109 print_public = 1; 1110 break; 1111 case 'd': 1112 key_type_name = "dsa"; 1113 break; 1114 case 't': 1115 key_type_name = optarg; 1116 break; 1117 case 'D': 1118 download = 1; 1119 case 'U': 1120 reader_id = optarg; 1121 break; 1122 case 'v': 1123 if (log_level == SYSLOG_LEVEL_INFO) 1124 log_level = SYSLOG_LEVEL_DEBUG1; 1125 else { 1126 if (log_level >= SYSLOG_LEVEL_DEBUG1 && 1127 log_level < SYSLOG_LEVEL_DEBUG3) 1128 log_level++; 1129 } 1130 break; 1131 case 'r': 1132 rr_hostname = optarg; 1133 break; 1134 case 'W': 1135 generator_wanted = strtonum(optarg, 1, UINT_MAX, &errstr); 1136 if (errstr) 1137 fatal("Desired generator has bad value: %s (%s)", 1138 optarg, errstr); 1139 break; 1140 case 'a': 1141 trials = strtonum(optarg, 1, UINT_MAX, &errstr); 1142 if (errstr) 1143 fatal("Invalid number of trials: %s (%s)", 1144 optarg, errstr); 1145 break; 1146 case 'M': 1147 memory = strtonum(optarg, 1, UINT_MAX, &errstr); 1148 if (errstr) { 1149 fatal("Memory limit is %s: %s", errstr, optarg); 1150 } 1151 break; 1152 case 'G': 1153 do_gen_candidates = 1; 1154 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1155 sizeof(out_file)) 1156 fatal("Output filename too long"); 1157 break; 1158 case 'T': 1159 do_screen_candidates = 1; 1160 if (strlcpy(out_file, optarg, sizeof(out_file)) >= 1161 sizeof(out_file)) 1162 fatal("Output filename too long"); 1163 break; 1164 case 'S': 1165 /* XXX - also compare length against bits */ 1166 if (BN_hex2bn(&start, optarg) == 0) 1167 fatal("Invalid start point."); 1168 break; 1169 case '?': 1170 default: 1171 usage(); 1172 } 1173 } 1174 1175 /* reinit */ 1176 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1); 1177 1178 if (optind < ac) { 1179 printf("Too many arguments.\n"); 1180 usage(); 1181 } 1182 if (change_passphrase && change_comment) { 1183 printf("Can only have one of -p and -c.\n"); 1184 usage(); 1185 } 1186 if (delete_host || hash_hosts || find_host) 1187 do_known_hosts(pw, rr_hostname); 1188 if (print_fingerprint || print_bubblebabble) 1189 do_fingerprint(pw); 1190 if (change_passphrase) 1191 do_change_passphrase(pw); 1192 if (change_comment) 1193 do_change_comment(pw); 1194 if (convert_to_ssh2) 1195 do_convert_to_ssh2(pw); 1196 if (convert_from_ssh2) 1197 do_convert_from_ssh2(pw); 1198 if (print_public) 1199 do_print_public(pw); 1200 if (rr_hostname != NULL) { 1201 do_print_resource_record(pw, rr_hostname); 1202 } 1203 if (reader_id != NULL) { 1204 #ifdef SMARTCARD 1205 if (download) 1206 do_download(pw, reader_id); 1207 else 1208 do_upload(pw, reader_id); 1209 #else /* SMARTCARD */ 1210 fatal("no support for smartcards."); 1211 #endif /* SMARTCARD */ 1212 } 1213 1214 if (do_gen_candidates) { 1215 FILE *out = fopen(out_file, "w"); 1216 1217 if (out == NULL) { 1218 error("Couldn't open modulus candidate file \"%s\": %s", 1219 out_file, strerror(errno)); 1220 return (1); 1221 } 1222 if (bits == 0) 1223 bits = DEFAULT_BITS; 1224 if (gen_candidates(out, memory, bits, start) != 0) 1225 fatal("modulus candidate generation failed"); 1226 1227 return (0); 1228 } 1229 1230 if (do_screen_candidates) { 1231 FILE *in; 1232 FILE *out = fopen(out_file, "w"); 1233 1234 if (have_identity && strcmp(identity_file, "-") != 0) { 1235 if ((in = fopen(identity_file, "r")) == NULL) { 1236 fatal("Couldn't open modulus candidate " 1237 "file \"%s\": %s", identity_file, 1238 strerror(errno)); 1239 } 1240 } else 1241 in = stdin; 1242 1243 if (out == NULL) { 1244 fatal("Couldn't open moduli file \"%s\": %s", 1245 out_file, strerror(errno)); 1246 } 1247 if (prime_test(in, out, trials, generator_wanted) != 0) 1248 fatal("modulus screening failed"); 1249 return (0); 1250 } 1251 1252 arc4random_stir(); 1253 1254 if (key_type_name == NULL) 1255 key_type_name = "rsa"; 1256 1257 type = key_type_from_name(key_type_name); 1258 if (type == KEY_UNSPEC) { 1259 fprintf(stderr, "unknown key type %s\n", key_type_name); 1260 exit(1); 1261 } 1262 if (bits == 0) 1263 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; 1264 if (type == KEY_DSA && bits != 1024) 1265 fatal("DSA keys must be 1024 bits"); 1266 if (!quiet) 1267 printf("Generating public/private %s key pair.\n", key_type_name); 1268 private = key_generate(type, bits); 1269 if (private == NULL) { 1270 fprintf(stderr, "key_generate failed"); 1271 exit(1); 1272 } 1273 public = key_from_private(private); 1274 1275 if (!have_identity) 1276 ask_filename(pw, "Enter file in which to save the key"); 1277 1278 /* Create ~/.ssh directory if it doesn't already exist. */ 1279 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); 1280 if (strstr(identity_file, dotsshdir) != NULL && 1281 stat(dotsshdir, &st) < 0) { 1282 if (mkdir(dotsshdir, 0700) < 0) 1283 error("Could not create directory '%s'.", dotsshdir); 1284 else if (!quiet) 1285 printf("Created directory '%s'.\n", dotsshdir); 1286 } 1287 /* If the file already exists, ask the user to confirm. */ 1288 if (stat(identity_file, &st) >= 0) { 1289 char yesno[3]; 1290 printf("%s already exists.\n", identity_file); 1291 printf("Overwrite (y/n)? "); 1292 fflush(stdout); 1293 if (fgets(yesno, sizeof(yesno), stdin) == NULL) 1294 exit(1); 1295 if (yesno[0] != 'y' && yesno[0] != 'Y') 1296 exit(1); 1297 } 1298 /* Ask for a passphrase (twice). */ 1299 if (identity_passphrase) 1300 passphrase1 = xstrdup(identity_passphrase); 1301 else if (identity_new_passphrase) 1302 passphrase1 = xstrdup(identity_new_passphrase); 1303 else { 1304 passphrase_again: 1305 passphrase1 = 1306 read_passphrase("Enter passphrase (empty for no " 1307 "passphrase): ", RP_ALLOW_STDIN); 1308 passphrase2 = read_passphrase("Enter same passphrase again: ", 1309 RP_ALLOW_STDIN); 1310 if (strcmp(passphrase1, passphrase2) != 0) { 1311 /* 1312 * The passphrases do not match. Clear them and 1313 * retry. 1314 */ 1315 memset(passphrase1, 0, strlen(passphrase1)); 1316 memset(passphrase2, 0, strlen(passphrase2)); 1317 xfree(passphrase1); 1318 xfree(passphrase2); 1319 printf("Passphrases do not match. Try again.\n"); 1320 goto passphrase_again; 1321 } 1322 /* Clear the other copy of the passphrase. */ 1323 memset(passphrase2, 0, strlen(passphrase2)); 1324 xfree(passphrase2); 1325 } 1326 1327 if (identity_comment) { 1328 strlcpy(comment, identity_comment, sizeof(comment)); 1329 } else { 1330 /* Create default commend field for the passphrase. */ 1331 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); 1332 } 1333 1334 /* Save the key with the given passphrase and comment. */ 1335 if (!key_save_private(private, identity_file, passphrase1, comment)) { 1336 printf("Saving the key failed: %s.\n", identity_file); 1337 memset(passphrase1, 0, strlen(passphrase1)); 1338 xfree(passphrase1); 1339 exit(1); 1340 } 1341 /* Clear the passphrase. */ 1342 memset(passphrase1, 0, strlen(passphrase1)); 1343 xfree(passphrase1); 1344 1345 /* Clear the private key and the random number generator. */ 1346 key_free(private); 1347 arc4random_stir(); 1348 1349 if (!quiet) 1350 printf("Your identification has been saved in %s.\n", identity_file); 1351 1352 strlcat(identity_file, ".pub", sizeof(identity_file)); 1353 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); 1354 if (fd == -1) { 1355 printf("Could not save your public key in %s\n", identity_file); 1356 exit(1); 1357 } 1358 f = fdopen(fd, "w"); 1359 if (f == NULL) { 1360 printf("fdopen %s failed", identity_file); 1361 exit(1); 1362 } 1363 if (!key_write(public, f)) 1364 fprintf(stderr, "write key failed"); 1365 fprintf(f, " %s\n", comment); 1366 fclose(f); 1367 1368 if (!quiet) { 1369 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); 1370 printf("Your public key has been saved in %s.\n", 1371 identity_file); 1372 printf("The key fingerprint is:\n"); 1373 printf("%s %s\n", fp, comment); 1374 xfree(fp); 1375 } 1376 1377 key_free(public); 1378 exit(0); 1379 } 1380